Biomechanics problem. Have no idea

AI Thread Summary
To determine the joint reaction force compression on the bone during shoulder abduction, a free body diagram should be constructed, illustrating the forces acting on the arm. Given the parameters, including the mass of the arm and hand, the force exerted by the middle deltoid, and the force from the theraband, the net forces can be calculated. The joint reaction force can be derived by considering the equilibrium of forces and the moments around the shoulder joint. The provided values, such as abduction angle and acceleration, are essential for accurate calculations. A thorough analysis will yield the joint reaction force necessary for understanding biomechanics in this context.
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humerus.png
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Shoulder abduction = 15°
Abduction acceleration = 50/rad/s/s
Abduction velocity = 20 rad/s
Radius of gyration and COM location from joint = 25cm
Mass of hand + Arm = 8 kg
Force of middle deltoid =400N
Middle deltoid only active muscle
Force of theraband = 70N
Middle deltoid insertion = 15°
Φ=90

The question is: solve for joint reaction force compression on the bone.
Also draw an appropriate free body diagram for this problem
 
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Please help ! thanks
 
You need to show some attempt. Start with a free body diagram.
Also, most readers on this forum won't know all these technical anatomy terms. An abstract force diagram will help us.
 

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